Cikcttit-bbeakeb



W. M. SCOTT.

cmcul BREAKER. 'MPUCATlON FILED NQV 28| |914.

- Patented Aug; 8, `1916.

2 SHEETS-SHEET n.

W. M. SCOTT'. CIRC-,UIT BREAKER.

PPLICATION HLED NOV.28,1914.

l ,1 93,622. Patente-d Aug. 8, 1916.

2 SHEETS-SHEET 2.

E; n vento@ STATES WILLIAM M. SCOTT.` 0E TREDYFFRIN ToWNsHIr, CHESTERCOUNTY,` PENNSYLVANIA;

` CIRCUIT-BREAKER.'

. Speeication of Letters I aten-t.

' ratentednug. 8,1916.

Original aiiplieatiion'lled ebr-uary, 191'2, Serial No. 675,534.Dividedand thisapplication filed November To all whom t may concern Beit known that I, WILLIAM IM. SCOTT,

a citizen of vthe United States, residing inl 'Tredyifrintownship,- in`the county of Chester and State of. Pennsylvania, have in-` vented a.new and useful Circuit-Breaker, of which the following isaspecification.

- My invention relates to `electric switches or circuit breakers, andmore'parti'cularly to electrically controlled switches or circuit.

breakers.

My invention resides in electric switch or circuit breaker constructionwherebya movable vswitch element,` such as a laminated bridging member,which, due to the great volume 'ofcurrent to be carried thereby, is.

` mechanically large and in the naturev of a very stiff spring, maynevertheless be vmoved to normal position l by the-hand of4 anoperator.'Tothi-s end I have provided .a novel arrangement of .toggles oroperating levers as hereinafter described, which, considering thenecessary'great force to be applied, oc-

cupies afininimum of -spaoe'outwardly from v the base 'or switchboard.lAnd my inventionresides further'in novel latching ork re?V strainingmeans and coperating. parts. f

I'My invention residesinthe features here# inafter` described andclaimed.

For an'illu-stration of one of the forms my invention'may take,reference is to be had to 'the accompanying drawings, in which:

F igure'l lis aside elevational vie'w| of an automatic circuit 'breakerinvolvingmy in vention and shown `in circuit closing position. .Fig. U2'is fa sidel elevational view,

partly" in section, showing the circuitl breakerl in open position. Fig..3 is af front elevational view, on enlarged kscale, of'the underload orno-voltage trippingzdevice and some-of the attached parts. Fig. 4 isa`side elevational view of oneof'the switch or circuit breaker operatinglevers or links. Fig. 5 is a side elevational :view of another switch orcircuit breaker operating leveror link,

- Fig. 6 is a side elevational' view of the' operatoris lever. 'Fig 7 is.a side elevational view of a part ofthe tripping mechanism. Fig. 8 is aside elevational Vview of another part of thetripping mechanism.

Referring to the drawings, a base 1 of slate, marble, orother suitableinsulating material, has secured thereon the main terminal blocks 2 and3' with which electrical 28, 1914. Serial-N0. 874,396.-

-`circuit, is the movable .when in the circuit .bon contact 10 are alsocarried by the piv- .successiom the final are taking communication heavycurrent conductingy studs 4. Adapted to bridge and'` electricallyconnectfthe terminal blocks 2 and 3, Iand thus close the contact member5 is ai'l'orded ythrough the' which is preferably a laminated bridgingmember and as such, particularly when very heavy .currents arev carried`thereby, is a stiff spring which is closingposition shown in Fig. 1. Themovable contact memberl 5 vis secured upon they arm 6 pivoted to the.housing 7 at 8. .The intermediate metallic shunt contact 9 and themovable shunt caroted arm 6, and engage respectively the stationarymetallic shunt Contact `11 and the vstationary shunt carbon contact 12.When the member-5 separates from the'niain terminal blocks 2 and 3, thecurrent isshunted through these shunt contacts which open in the carboncontacts 10 and 12.v

more or less compressed placebetween The operators -lever` 13 ,having ahand,

grip 14 .is 'pivoted at 15 to the housing 7. Pivoted. to theinner endofIthe operatoifs lever 13 yat 16 is a link 17, shown separately inFig. 5,to whose other endlthereis piv- 'I ,o tedat 18 another link 19,l shownseparately in Fig. 4. i To the other end ofthe link 19 at.20,.is'pivoted the arm 6. Pivoted `at l18, i

independently of the linksk 17 and 19, is the link or lever 2l pivotedat its inner end at 22 to the housing' 7. y

The link 17 w-liichl maybev considered as f bifurcated or having twoside arms, is 'provided with a surface 17a adapted te engage the surface13a on the operators lever 1 3 as shown in -Fig. 1, the engagementofthese surfaces preventing the over travel `of the toggle comprisingthe linkslv and 17, the

end pivots being l5 andf18., and tlievintermediate 'pivot Iis 16. Uponthe lever 13 'is provided a buiier 23 adapted-to be engaged by the link19 to' cushion the same and attached parts when the circuit"O breakerreachesfull open circuit position as shown in Fig. 2'. A second-'toggleiscomprised of the links 21 and 19, the en'd pivots being 22 and 18,-andthe intermediate pivot is 2O..` As shwnin Fig. l, the -pivot20 does 'notreach y the" imaginary .straight linev joining the centers'of theypivots 22 and 18 but ap# proaohes soj close "thereto'that a toggleaction occurs. `A'spring S is connected at its `plate 32 which preventsclockwise one. end to the pivoted arm 6 and at its other end to a pivot'16 forming a joint between the toggle links 13 and 17. lith the parts inthe position shown in Fig. 1, the spring S isY under tension.

When the parts are in open circuit position, as shown in Fig'. Q, theswitch or circuit breaker may be closed' by grasping the handle 111 androtating the operators lever i 13 in a clockwise direction about itspivot 15.

In so doing, the 4closing force is transmitted from the link 13 throughthe link 17 to the pivot 18 which rotates the lever or link Q1 in acounter-clockwise direction about its pivot 2:?. This rotation of thelink Q1 is accompanied by a transmission of force from the link 21through the. link 19 to the pivotr Q0. causing a counter-clockwiserotation of the arm G about its pivot 8, thus bringing the bridgingmember 5 closer and closer to the terminal blocks 2 and 3. lVhen` thestiff spring contact 5 engages the main contacts 2 and 3, itstronglyopposes further movement, due to .its spring characteristics..Then this first contact position is reached, the toggles are almost inthe position shown in Fig. 1, that is, both out so that they areexerting nearly their maximum force in directions determined byimaginary straight lines joining their end pivots. That is to say, thetoggle 13, 17 is exerting almost its' maximum torce upwardly on thepivot 18, as viewed in Fig. 1; and the toggle 19, 21 is exerting almostits maximum force toward the left on pivot Q0, and, therefore, upontliecontact member A further movement `of the operators lever 13 is, asbefore stated, resisted by the spring of the, member 5. But the togglesare now position where they are capable ot exerting their practicallygreatest thrusts and, in consequence, an operator is enabled by thefurther movement of the lever 13 to bring the contact member 5 firmlyand securely into engagement with the terminal blocks 2 and 3 by sliglly defiecting and .bending the stii spring :s .l rilhe parts have nowposition shown in Fig. 1 and are restrained or latched in that positionby thedog or latch member 2-1 pivoted loosely on the pivot 16 andthrusting at its lower left hand end 25, Fig. 1, against the roller Q6,pivoted to the limisiiig at 27. The latch 9,1 is thus under compressionand prevents the collapse of the toggles and the opening of the switchor' circuit breaker. Pivoted preferably coaxially with the pivot 27 arethe latch actuator QS, shown separately in Fig. T, and the trippingmember 2t), shown separately in Fig. 3. The latch actuator 2S has a noseor projection 3() adapted to engage tl=e under side of the latch "1. Thelatch actuator 2S has a nose lwinch engages a stationary rotation ot'the member 'lllie leit hand end of the toggles are nearly straightenedin the attained themember 28 extends into the path of travel ot' thearmature lever 33 pivoted to the housing at 31 and carrying at its innerend the The vhandle 3S extends through a horizontal slot in the plate 32and carriesat its Ainner end back of the plate 32 a member 39V which,for different positionsot thehandle 3S shitts'the armature lever 33 4todifferent positions about its pivot 31 due to the cooperation of thearin 40 upon the armature lever 33: This sets the armature 35 todi'erent positions with respect to the poles 3G, so'

that the tripping magnet 33, 35may be cali'- brated to trip the breakerupon diferent current loads. o

Supported bythe housing is an electroi magnet here shown in the form ofa cylindrical winding 41 having its axis' horizontalA and extendingparallel tothe base. 1. The

iron core 4,2, also horizontal, has secured `at ing across the thearmature 14: pivoted at l5. `The electroinagnet is normally energized bycurrent traversing .the vv'inding 41 and thus att ac ts the armatureLl-l intotlie position shown in` Figs. 1, 2 and 3, 1n opposition to thespring `the member 2S in a.counter-clockwise direction upon its pivot2T, but allowing the member 29 to move in opposite direction without4moving the member 2S.` The member i2!) has also the projection 51extending into vthe path of t avel of the junction of the vlinks 17 and13. 4

They ope 'ation is as follows: 'ith the parts in circuit closingposition, as shown in Fig. 1, the switch or circuit breaker may betripped b v either the armature 35 or armature ll, 'hen the armature 35is attracted b v the pole piece 3G, as when the current strength throughthe switch or circuit breaker attains a predetermined value.` thearmature lever 33 moves in a clockwise direction about its Vpivot 3l andits right hand cnd strikes upon the upper side of the latch each of itsends a pole p1ece`43,and extendfront of these pole pieces is` actuatinglmember 2S which then rotates in i ii isb

Wise' .direction about its 'pivot 1G andv freeing it lfrom the roller26. lliisj allows tlie bridge other, The' counterolool'mise' "movementof and spring Sto collapse the toggl'esandthe eirenit breaker parts flyto the .position f' shown 1n. Fig. 2, breaking tlie' cireuit.. V'In thisopening f movement, spring 'contracts pulling arm .6` yand pivot .1 6towardA eachl ity move the' armature lll -in-.a eloekyvisewdi----rection about itspiyot' 4 5, as -viewed in' Figs` 9 and causing the'-nose 3G- toV 4 7. as' previously "described, whereupon' 'tli'elcircnitbreaker opensfand a ssu'lnes the position slioWnin Fig.v 2L .Buti 'as29, moving .itback 'again to" the position slio-Wn. in- Figs 1'- and4 2,'Whereit restores the armaturef'Mto theposit'ion' sliogwn in Ili'g's.

v1 `and' 2, Sothat Iif-l'atfer the' Winding ,411' 'is is 1"etai'ned bymagnetism' andltlie opening o r tripping' 'may be repesLtedl4 Ineolosingtliezcircuit breakerthe operators lever 131s reached the 'open Circuit'position' shown Yin 4 .Fig-. 2 tliedepiression' in the under side ofthethe 25 again thrusts 'against the roller 2G to' hold the parts in theposition shown in Fig. 1. "f'

'aPRlicationfifs a. divisi-:on froni'niy'l prior applicatlon 'Se`ri-al.Number 675,534,

-filed February-Q5, 11912. What -I claim is; 1

`rr'l. In. 'an'iele'otr'ief switeln a base, a Contact oarryingvarm"pivoted .directly to'sa'id' base,

ontaotsecu'r'e'd on said arm' in lixedrelaj- Etlnei'eto,alinlrpiiotedtofsaid base, a

eeted "at'j :the oint between said links, and

thrusting agai'nst'saidj base. to hold 'gies extended.

'2. The combinatlonwithahase, orarcon- 'tact' Carrying member; movable.foward and A away from s aid b ase, a togglecomprising 'links pivotedto said member 'and to said base respeetiyely, k a s'eeond I' :toggle-for :operating -sad first toggle, both toggles'be'ing underset "whensald f contact 'earrylng member is in.

s or er. 'flink' piyoted to saidv link and to 'sa-id contactoarrying'arm, a second toggleI-eonnormal iposition,-a 'pno'jeotionon a:link "cpjfl;y Asaid second toggle engaging the .Other link 0f lsaidtoggleto limit v extension'- of 'said second sai-d "second, toggle andthrusting 'aga-instj' said base 'toi restrain s 'aid toggles in theirexe.

.'tendedf positions.

toggle 'and thrusting :against fsaidfbase' forholdingsaid-'toggle'extended, a dog' actuator-- Contact 'nuernbergvtogglellinks for actuating the same', 'af pivot cornxno'n tos'aid'links, a' dog supported on saidpivo't, ay roller pivot'ed on saidbase,'tlie free end-`of saiiddog'tlirl'isting-'against sa-ifd'rol-le'r,'andai dog' actuator' -In an electric' switch', atv base',- a. movable.'contact' member, 'a toggle, for actuating' the pivoted'on saidbasecon'oentriea'lly With'said aiiixed "my signatre kin' thepresenet of.tlie'

